Is that when you are just riding on and off the table lift? ZZZZZZZZZZZZZZZZZZZZZZZ

Seriously though, it's a matter of personal preference. Try starting at 20#'s solo and working down from there. Your weight and any additional weight that you add to the bike are the determining factors. I ride at 10#'s solo and 18-20#'s with the TP and 2 up.

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My bike has FOOTBOARDS and my F150 has FLOORBOARDS.

You wanna make someone's day? When you are out on a ride, stop at a kid's roadside lemonade stand. Then try to decide whose day was really made.

Ok question for the check your manual people. Why such a significant difference in pressure compared to new bikes?

The 09 and newer have reworked shocks that have different air pressure ranges. But what it comes down to is what pressure gives you the type of ride you like. I used to run 10 -12 most of the time solo, my buddy rides the same bike and is about 10 lbs heaver than me and he likes 16 lbs.